can a dog tooth that needs to be pulled cause bad breath?

My dog is a 2 yr old daschund who has terrible breath. I brush her teeth about once every week but it never seems to do the trick. I dont feed her any table scraps so that wouldnt be the problem. She does need a baby tooth pulled which I am wondering if that is the root of the bad breath?

Since this dog is 2 years old and still has a baby tooth left in her mouth, it very well could be rotting. Also, it can cause the other teeth to misalign, which could cause one of the other teeth to punch through the roof of her mouth. (I’ve seen that). A retained deciduous (baby) tooth should never be left alone. They do not fall out on their own and cause problems with alignment, (moving the adult teeth to the wrong positions).

Can glands cause bad breath?

So i have this problem, lol.
A long time ago, I’d say about 4 years ago, i found this lump on the bottom of my head, like underneath the chin, ontop of the neck? lol. Well it was something to do with my glands and I have been getting severely bad breath since I was little. I brush my teeth fine, dentists say i have 98% perfect teeth, i use colgate, mouthwash. I really do not want bad breath, I’m getting older and its an incredibly bad turn off to have bad breath.
Its not my fault, I do everything right, my glands arent though :/
So i am getting a doctors appointment soon and I just want to know what you think is wrong with my glands, and if there is anything wrong with them will i have to have something happen to them, like an operation. lol i have noo idea.
if I do need one, what would it be? Please help, I can’t live like this forever.
The lump went a long time ago, but I do think it is something to do with my glands.

Another thing you might want to look into is your diet. Its a probability that the bad breath is not coming from your mouth but from your gastrointestinal tract( ie. stomach). “You are what you eat”, if you have an unhealthy diet your body odor, sweat, body secreations(glands) will show it. Stay off the meats and fatty foods for a while and try a herbal total body cleanser.